Diesel fuel requirs a hotter spark for ignition and burns pretty dirty, better off with K1 kerosene. You could change the ignition system to a mutifuel but it's not cheap and may not mount to your current houseing but would still work. As for restarting it is one of two things: the hight heat limit control or most likely teh CAD flame sensor, both of which you can get from Mr. Heater for less than 3 bucks each. the mount for the limit control is different but you can simply remount it to your heater mount. Same thing with the flme sensor, the wires are different but you can splice the to your wire harness and it will be fine. there is no wrong way to hook them up so don't worry about ground or hot.

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I would start by installing a new thermostat because it sounds to me like it's either the thermostat or the control board and the t-stat is the less expensive of the two. I hope this helps you and thanks.

Your heater has a photocell eye and a computer board (ignition control). This team monitors the flame. If the team does not like the color of the flame then they shut the heater down and that is the situation you are in. Now, you must troubleshoot & find the problem. Is it water in the fuel, incorrect air pump pressure, worn nozzle, cracked plastic cover, etc.

make sure its not a problem with the low voltage wiring to the stat. the other problem with not firing i either pressure switch not making or the flame sensor is dirty/thermal coupler (not sure which one it has)

i have to ask ...what is the air pressure set at.very important that it is set correctly.if it isn't the unit will only run a few seconds then shut it self down.look at the back plate and see if there are any cracks at the adjuster boss or the plug boss.if there is one the pressure is not correct and the unit will not run right.but to set the pressure you need to have a gauge so the air pressure can be set to the right psi...

sound like there is dirt and stuff in the fuel tank.when the heater fires up it pulls this stuff up into the filter.as it runs it plugs the filter off causing the heater to shut off.whe it shuts off the garbage falls back into the tank.when you refire the heater it pulls the garbage back up again.it never pulls it up the same so the time verys every time

There are dip switches on the main board.. When you remove the lower panel on the air handler there are instructions to where the dip switches should be for your units fan control. if the switches are in the correct configuration.. The Thermostat may be malfunctioning or not wired properly. and last.. and most expensive.. the motherboard may also be failing.

If the heater runs fine for the 15 or so minutes without smoke/odor- do this

check for water droplets on bottom of tank

check for restricted fuel filter

test photocell

test safety control (reset)

You don't state whether this is a spark plug heater *or* Hot Surface Ignitor type. I made the assumption you were inquirung about a Spark Plug Heater. Disregard the list if the heater is an HSI type---- troubleshooting is different.

Had similar problem, continuous fan, turn off power, then won't start up. Replaced thermostat, no change. The main controller board in the furnace went bad. What was weird was that it happened in the summer, while the heat was turned off. One day I noticed that the fan was running. The thermostat was in the off position, and I had to shut off power to the furnace to make it stop. I forgot about it till heating season came along and it wouldn't start up. The preliminary blower would start, the gas would click on, it would light, then quit. After tracing and checking the various safety switches, etc. it became apparrent the main board was bad. I found one on ebay, replaced it, [a simple job, unplug, a few screws, replug] and it's been working fine..good luck, John